Messed around a bit with all the Novice modes now. Figured I'd write up some thoughts and impressions for anyone who is interested but intimidated by these games. Keep in mind the below is based on rough playthroughs of each difficulty, you do your thing however you want, etc etc.
So you've given Original/Original an honest shot (if not you really, really should) and decided it isn't happening for whatever reason. Before giving up on the game or genre entirely there is a Novice mode which could be the key to getting you over some of the humps and honing your skills.
I would NOT recommend going immediately to Novice/Original and instead would start with Novice/Maniac for a couple reasons.
Novice/Maniac does a decent job of throwing pressure at you but keeping it manageable. What I mean is that the bullet density will be quite high and scary, but the patterns are actually fairly kind to navigate which will give you good practice of executing under pressure, learning to find paths, and so on without beating you into the ground with it.
The other reason I would start with Novice/Maniac is that if you are still having a difficult time of it then you have the Novice/Original option to move down to the bare basic fundamentals of the game. Pressure is basically non-existent in Novice/Original until the final stage and even then a few well timed bombs makes it a walk in the park.
From there you have options of going back to Original/Original, or if you want to step up the pressure even more can give Novice/Ultra a go.
I would strongly recommend not messing with Novice and calling it good. Not all of CAVE's games have Novice modes and the quality of each one varies. At some point you will need to familiarize yourself with the difficulty ramps and patterns that the standard versions of the games use. That said, and as others have pointed out, Original/Original in Mushi1 is about as approachable as it gets for these games so don't necessarily sell yourself short and immediately run to Novice. Novice is good for gaining a familiarity but don't allow it to become a crutch.